You are focusing on the people doing the arresting
This is incorrect
Frank and Bubba, the guards that are on the midnight watch are not 'Above' anyone
They have certain responsibilities
They get their ORDERS from higher command
What command has the authority to instruct guards to arrest a head of State?
What authority would need to be granted by what body?
War is an excellent example.
Corporal Smuckatelli who is part of a squad searching holes in the ground finds Saddam
Is the corporal more powerful than a head of state?
Yes because he has the weapon and will pull the trigger